237 lines
6.0 KiB
C++
237 lines
6.0 KiB
C++
// TestView.cpp : implementation of the CTestView class
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//
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#include "stdafx.h"
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#include "Test.h"
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#include "math.h" //数学头文件
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#define Round(d) int(floor(d + 0.5)) // 四舍五入宏定义
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#include "TestDoc.h"
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#include "TestView.h"
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#ifdef _DEBUG
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#define new DEBUG_NEW
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#undef THIS_FILE
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static char THIS_FILE[] = __FILE__;
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#endif
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/////////////////////////////////////////////////////////////////////////////
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// CTestView
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IMPLEMENT_DYNCREATE(CTestView, CView)
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BEGIN_MESSAGE_MAP(CTestView, CView)
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//{{AFX_MSG_MAP(CTestView)
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ON_WM_MOUSEMOVE()
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ON_WM_LBUTTONDOWN()
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ON_WM_LBUTTONUP()
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ON_COMMAND(IDM_DRAWPIC, OnDrawpic)
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//}}AFX_MSG_MAP
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// Standard printing commands
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ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
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ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
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ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
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END_MESSAGE_MAP()
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/////////////////////////////////////////////////////////////////////////////
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// CTestView construction/destruction
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CTestView::CTestView()
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{
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// TODO: add construction code here
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m_AbleToLeftBtn = FALSE;
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m_AbleToMove = FALSE;
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m_i = -1;
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P[0] = CPoint(900, 150);
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P[1] = CPoint(960, 300);
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P[2] = CPoint(1050, 450);
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P[3] = CPoint(900, 600);
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P[4] = CPoint(750, 450);
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P[5] = CPoint(840, 300);
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P[6] = CPoint(900, 150);
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}
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CTestView::~CTestView()
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{
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}
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BOOL CTestView::PreCreateWindow(CREATESTRUCT &cs)
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{
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// TODO: Modify the Window class or styles here by modifying
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// the CREATESTRUCT cs
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return CView::PreCreateWindow(cs);
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}
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/////////////////////////////////////////////////////////////////////////////
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// CTestView drawing
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void CTestView::OnDraw(CDC *pDC)
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{
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CTestDoc *pDoc = GetDocument();
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ASSERT_VALID(pDoc);
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// TODO: add draw code for native data here
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CRect rect; // 定义客户区
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GetClientRect(&rect); // 获得客户区的大小
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CDC MemDC; // 内存DC
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CBitmap NewBitmap, *pOldBitmap; // 内存中承载图像的临时位图
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MemDC.CreateCompatibleDC(pDC); // 建立与屏幕pDC兼容的MemDC
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NewBitmap.CreateCompatibleBitmap(pDC, rect.Width(), rect.Height()); // 创建兼容位图
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pOldBitmap = MemDC.SelectObject(&NewBitmap); // 将兼容位图选入MemDC
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MemDC.FillSolidRect(rect, pDC->GetBkColor()); // 按原来背景填充客户区，否则是黑色
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CPen NewPen, *pOldPen;
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NewPen.CreatePen(PS_SOLID, 3, RGB(0, 0, 0));
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pOldPen = MemDC.SelectObject(&NewPen);
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MemDC.MoveTo(P[0]);
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MemDC.Ellipse(P[0].x - 2, P[0].y - 2, P[0].x + 2, P[0].y + 2); // 绘制控制多边形顶点
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for (int i = 1; i < 7; i++)
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{
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MemDC.LineTo(P[i]);
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MemDC.Ellipse(P[i].x - 2, P[i].y - 2, P[i].x + 2, P[i].y + 2);
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}
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if (m_i != -1)
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{
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CString str;
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str.Format("x=%d,y=%d", P[m_i].x, P[m_i].y);
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MemDC.TextOut(P[m_i].x + 5, P[m_i].y + 5, str);
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}
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B3Curves(P, &MemDC);
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pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &MemDC, 0, 0, SRCCOPY); // 将内存位图拷贝到屏幕
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MemDC.SelectObject(pOldPen);
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NewPen.DeleteObject();
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MemDC.SelectObject(pOldBitmap); // 恢复位图
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NewBitmap.DeleteObject(); // 删除位图
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MemDC.DeleteDC(); // 删除MemDC
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}
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/////////////////////////////////////////////////////////////////////////////
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// CTestView printing
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BOOL CTestView::OnPreparePrinting(CPrintInfo *pInfo)
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{
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// default preparation
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return DoPreparePrinting(pInfo);
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}
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void CTestView::OnBeginPrinting(CDC * /*pDC*/, CPrintInfo * /*pInfo*/)
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{
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// TODO: add extra initialization before printing
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}
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void CTestView::OnEndPrinting(CDC * /*pDC*/, CPrintInfo * /*pInfo*/)
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{
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// TODO: add cleanup after printing
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}
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/////////////////////////////////////////////////////////////////////////////
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// CTestView diagnostics
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#ifdef _DEBUG
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void CTestView::AssertValid() const
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{
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CView::AssertValid();
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}
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void CTestView::Dump(CDumpContext &dc) const
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{
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CView::Dump(dc);
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}
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CTestDoc *CTestView::GetDocument() // non-debug version is inline
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{
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ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CTestDoc)));
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return (CTestDoc *)m_pDocument;
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}
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#endif //_DEBUG
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/////////////////////////////////////////////////////////////////////////////
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// CTestView message handlers
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void CTestView::B3Curves(CPoint q[], CDC *pDC)
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{
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CPoint p;
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double F03, F13, F23, F33;
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// 设置起点
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p.x = Round((q[0].x + 4.0 * q[1].x + q[2].x) / 6.0);
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p.y = Round((q[0].y + 4.0 * q[1].y + q[2].y) / 6.0);
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pDC->MoveTo(p);
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// 使用红色画笔
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CPen NewPen(PS_SOLID, 2, RGB(255, 0, 0));
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CPen *pOldPen = pDC->SelectObject(&NewPen);
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// 计算B样条曲线点
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for (int i = 0; i < 7; i++)
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{
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for (double t = 0; t <= 1.0; t += 0.05)
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{
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// B样条基函数
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F03 = (-t * t * t + 3 * t * t - 3 * t + 1) / 6.0;
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F13 = (3 * t * t * t - 6 * t * t + 4) / 6.0;
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F23 = (-3 * t * t * t + 3 * t * t + 3 * t + 1) / 6.0;
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F33 = t * t * t / 6.0;
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// 计算曲线上的点
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int j = i % 7; // 循环索引确保首尾相连
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int j1 = (i + 1) % 7;
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int j2 = (i + 2) % 7;
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int j3 = (i + 3) % 7;
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p.x = Round(q[j].x * F03 + q[j1].x * F13 + q[j2].x * F23 + q[j3].x * F33);
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p.y = Round(q[j].y * F03 + q[j1].y * F13 + q[j2].y * F23 + q[j3].y * F33);
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pDC->LineTo(p);
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}
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}
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pDC->SelectObject(pOldPen);
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NewPen.DeleteObject();
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}
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void CTestView::OnMouseMove(UINT nFlags, CPoint point) // 鼠标移动函数
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{
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// TODO: Add your message handler code here and/or call default
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if (TRUE == m_AbleToMove)
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P[m_i] = point;
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m_i = -1;
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int i;
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for (i = 0; i < 7; i++)
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{
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if ((point.x - P[i].x) * (point.x - P[i].x) + (point.y - P[i].y) * (point.y - P[i].y) < 50)
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{
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m_i = i;
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m_AbleToLeftBtn = TRUE;
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SetCursor(LoadCursor(NULL, IDC_SIZEALL)); // 改变为十字箭头光标
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break;
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}
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}
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if (10 == i)
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{
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m_i = -1;
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}
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Invalidate(FALSE);
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CView::OnMouseMove(nFlags, point);
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}
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void CTestView::OnLButtonDown(UINT nFlags, CPoint point) // 鼠标左键按下函数
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{
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// TODO: Add your message handler code here and/or call default
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if (m_AbleToLeftBtn == TRUE)
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m_AbleToMove = TRUE;
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CView::OnLButtonDown(nFlags, point);
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}
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void CTestView::OnLButtonUp(UINT nFlags, CPoint point) // 鼠标左键弹起函数
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{
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// TODO: Add your message handler code here and/or call default
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m_AbleToLeftBtn = FALSE;
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m_AbleToMove = FALSE;
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m_i = 0;
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CView::OnLButtonUp(nFlags, point);
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}
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void CTestView::OnDrawpic()
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{
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// TODO: Add your command handler code here
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MessageBox("请直接拖动控制多边形顶点观察效果！", "信息", MB_ICONINFORMATION | MB_OK);
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}
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